基于小波变换方法划分塔里木三叠系层序及湖平面变化分析

综合钻测井等资料，以小波分析方法为基础，对每个区带各挑选数口井，对其自然伽马测井曲线进行小波变换，得到多级次旋回曲线，来进行高频层序划分，旨在刻画台盆区三叠系不同构造单元内层序发育情况，并在此基础上得到Fischer图解来分析该地区相对湖平面升降规律。结果表明，台盆区三叠系地层旋回以塔北隆起带保存的最为完整，湖平面变化曲线也最为完善。在塔北隆起带完整度最高的A1井中识别出5个长周期旋回，9个中周期旋回，61个短周期旋回。三叠系台盆区相对湖平面整体上为一次大规模的湖退与湖侵，可容纳空间最低值在克拉玛依组中期，黄山街组时期达到顶峰。湖平面变化曲线内部还有5次小规模的湖侵湖退，且受到古地貌、物源的影响，有差异性变化。

The division of Triassic sequence and analysis of lacustrine level changes in Tarim Basin Based on Wavelet Transform

Based on the data of drilling and logging and wavelet analysis method, several wells are selected for each zone, and their natural gamma logging curves are transformed by wavelet to obtain multi-level cycle curves for high-frequency sequence division. The purpose is to describe the development of stratigraphic sequence in different structural units of Triassic in the platform area, and obtain the Fischer diagram solution to analyze relative lacustrine level changes in this area. The results show that the Triassic stratigraphic sequence in the platform area is the most complete preserved in the Tabei uplift belt, and the lacustrine level changes curve is also the most perfect. In the logging of Tabei uplift belt, 5 long-term sequence cycles, 9 middle-term sequence cycles and 61 short-term sequence cycles were identified in well A1 with the highest integrity. The relative lacustrine level of the Triassic platform area is a large-scale lacustrine regression and lacustrine transgression as a whole, and the lowest accommodation space reaches the peak in the middle of Karamay formation and Huangshan Street formation. There are also five small-scale Lake transgressions and retreats within the lake level change curve, which have different changes due to the influence of ancient landform and provenance.